1820445146 has 16 divisors (see below), whose sum is σ = 2941639848. Its totient is φ = 839942400.

The previous prime is 1820445131. The next prime is 1820445149. The reversal of 1820445146 is 6415440281.

It can be written as a sum of positive squares in 4 ways, for example, as 857025625 + 963419521 = 29275^2 + 31039^2 .

It is a super-2 number, since 2×1820445146² = 6628041059189922632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1820445149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91886 + ... + 109926.

Almost surely, 2^1820445146 is an apocalyptic number.

1820445146 is a deficient number, since it is larger than the sum of its proper divisors (1121194702).

1820445146 is a wasteful number, since it uses less digits than its factorization.

1820445146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21937.

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 1820445146 is about 42666.6748880200. The cubic root of 1820445146 is about 1221.0286822419.

The spelling of 1820445146 in words is "one billion, eight hundred twenty million, four hundred forty-five thousand, one hundred forty-six".